uiwebview中的javascript事件处理程序 [英] javascript event Handler in uiwebview

问题描述

我在iPhone应用程序中显示一个UIWebView。在UIWebView中，我也显示了具有JavaScript的HTML页面。我想在HTML页面中单击一个按钮时调用方法（X代码）。

I am displaying one UIWebView in my iPhone application. In UIWebView I am displaying HTML page which has JavaScript also. I want to call method(of X Code) when one button is clicked in HTML page.

我该怎么做。
谢谢

How can I do this. Thanks

推荐答案

如果我理解你的问题，你想从javascript <$调用Objective C方法c $ c> onClick UIWebView 中的事件处理程序。这样做的方法是将浏览器重定向到javascript代码中带有自定义方案的URL，如下所示：

If I understand your question correctly, you want to call an Objective C method from a javascript onClick event handler in your UIWebView. The way to do that is to redirect the browser to a URL with a custom scheme in your javascript code like this:

function buttonClicked() {
    window.location.href = "yourapp://buttonClicked";
}

返回目标C，声明您的视图控制器符合 UIWebViewDelegate 协议，

Back in Objective C, declare that your view controller conforms to the UIWebViewDelegate protocol,

@interface DTWebViewController : DTViewController <UIWebViewDelegate> {
...

将您的控制器设置为Web视图的委托，

set your controller as the web view's delegate,

- (void)viewDidLoad {
    [super viewDidLoad];
    self.webView.delegate = self;
}

并在加载之前截取网址：

and intercept the URL before it loads like this:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if ([[request.URL scheme] isEqual:@"yourapp"]) {
        if ([[request.URL host] isEqual:@"buttonClicked"]) {
            [self callYourMethodHere];
        }
        return NO; // Tells the webView not to load the URL
    }
    else {
        return YES; // Tells the webView to go ahead and load the URL
    }
}

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